CPE Packaging Materials & Components 3

Question 1

In glass container manufacturing, what is the primary purpose of annealing?

Accepted Answer

Relieving internal stresses after forming

Answer

Annealing involves controlled slow cooling of glass containers to relieve internal stresses that would otherwise cause breakage.

Question 2

Which property best describes the 'coefficient of friction' (COF) in flexible packaging films?

Accepted Answer

The ratio of friction force to normal force between film surfaces

Answer

COF measures the slipperiness between film surfaces, critical for machine runnability and stacking stability of finished packages.

Question 3

What is the primary advantage of using aluminum foil as a packaging barrier material?

Accepted Answer

Near-zero transmission of gases, moisture, and light

Answer

Aluminum foil at sufficient gauge provides essentially complete barriers to gases, moisture vapor, and light, the best barrier among flexible packaging materials.

Question 4

In metal can manufacturing, what does 'double seam' refer to?

Accepted Answer

The interlocking fold joining lid and body ends

Answer

A double seam is formed by mechanically rolling and interlocking the can end's curl with the body flange to create a hermetic seal.

Question 5

Which packaging material property is expressed as 'cc·mil/100 in²·day·atm'?

Accepted Answer

Oxygen transmission rate (OTR)

Answer

Oxygen transmission rate (OTR) is expressed in cc·mil/100 in²·day·atm, quantifying oxygen permeation through a film under standard conditions.

(CPE) Certified Packaging Engineer Practice Test

(CPE) Certified Packaging Engineer Practice Test

CPE Packaging Materials & Components 3